BAI Gailing ¹ , GOU Li ¹ , RAN Junguo ¹ , XU Xuezhen ²

（1. College of Materials Science and Engineering, Sichuan University，Chengdu Sichuan 610065,China； 2. North China Research Institute of Electro-optics (NCRIEO)，Beijing 100015, China）

Abstract: Yttrium aluminum garnet（YAG）powders were synthesized by homogeneous precipitation method using Al(NO₃)₃·9H₂O, Nd₂O₃ and Y₂O₃ as raw materials, urea as precipitator and (NH₄)₂SO₄ as dispersion medium, and TEOS as sintering additive. Effects of reaction temperature, pH value and urea concentration on powder purity and ceramic transmittance were investigated. The results show that loosely dispersed and slightly agglomerated YAG powders with an average particle size of about 28 nm were obtained when the pH of the final solution was about 6 and the urea concentration was 2M under 92℃. After 1785℃ vacuum sintering, transparent ceramics with the transmittance of 65.2% at 1064nm was prepared.

Keywords: homogeneous precipitation, Nd:YAG nano-sized powder, transparent ceramics